WTJP24 RJTD 151800 WARNING 151800. WARNING VALID 161800. WARNING IS UPDATED EVERY 6 HOURS. GALE WARNING. TROPICAL STORM 1818 RUMBIA (1818) 996 HPA AT 29.7N 124.8E EAST CHINA SEA MOVING WESTNORTHWEST 09 KNOTS. POSITION FAIR. MAX WINDS 35 KNOTS. RADIUS OF OVER 30 KNOT WINDS 180 MILES SOUTHEAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 160600UTC AT 30.1N 123.7E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 35 KNOTS. FORECAST POSITION FOR 161800UTC AT 30.6N 121.5E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 40 KNOTS. EXTENDED OUTLOOK. FORECAST POSITION FOR 171800UTC AT 31.8N 116.3E WITH 110 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 35 KNOTS. FORECAST POSITION FOR 181800UTC AT 33.1N 113.9E WITH 130 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=